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Directional quantification of power dissipation in sound-absorbing metaporous layers
Journal of Sound and Vibration ( IF 4.3 ) Pub Date : 2021-07-30 , DOI: 10.1016/j.jsv.2021.116375
Jun Hyeong Park 1 , Joong Seok Lee 2 , Yoon Young Kim 1
Affiliation  

Metaporous layers composed of finite-length porous layers with rigid inclusions embedded have recently received much attention given their ability to greatly enhance sound absorption. Compared with homogeneous porous layers, the insertion of rigid inclusions into porous layers can lead to a significant enhancement in the sound-absorbing performance. It is because the resulting inhomogeneity in metaporous layers generates multidirectional effects to dissipate the sound power, which may not be observed in homogeneous porous layers. This implies that directional evaluations of sound power dissipation in metaporous layers can be important for better designs that yield further enhancements of the sound-absorbing performance. In most previous works related to metaporous layers, unfortunately, quantitative studies of the directional characteristics of sound power dissipation inside of the layers are relatively rare. In this work, we investigate the directional effect of rigid inclusions on the dissipation of sound power in metaporous layers quantitatively. By spatially decomposing the dissipated power in orthogonal directions, the directional characteristics of sound power dissipation are evaluated along the thickness and lateral directions of hard-backed metaporous layers. The present directional quantification provides greater insight for those attempting to interpret the performance capabilities of metaporous layers and can be applied as well to the creation of optimal designs for these types of layers.



中文翻译:

吸声变孔层中功率耗散的定向量化

由嵌入刚性夹杂物的有限长度多孔层组成的变孔层最近受到了很多关注,因为它们能够大大增强吸声能力。与均质多孔层相比,将刚性夹杂物插入多孔层中可以显着提高吸声性能。这是因为在变孔层中产生的不均匀性会产生多向效应来消散声功率,这在均质多孔层中可能观察不到。这意味着对超多孔层中声功率耗散的定向评估对于更好的设计非常重要,从而进一步增强吸声性能。不幸的是,在大多数以前与元多孔层相关的工作中,对层内声功率耗散方向特性的定量研究相对较少。在这项工作中,我们定量地研究了刚性夹杂物对变孔层中声功率耗散的方向性影响。通过在正交方向上对耗散功率进行空间分解,沿硬背变质层的厚度和横向评估声功率耗散的方向特性。目前的定向量化为那些试图解释隐孔层的性能能力的人提供了更深入的了解,并且也可以应用于为这些类型的层创建最佳设计。我们定量地研究了刚性夹杂物对变孔层中声功率耗散的方向性影响。通过在正交方向上对耗散功率进行空间分解,沿硬背变质层的厚度和横向评估声功率耗散的方向特性。目前的定向量化为那些试图解释隐孔层的性能能力的人提供了更深入的了解,并且也可以应用于为这些类型的层创建最佳设计。我们定量地研究了刚性夹杂物对变孔层中声功率耗散的方向性影响。通过在正交方向上对耗散功率进行空间分解,沿硬背变质层的厚度和横向评估声功率耗散的方向特性。目前的定向量化为那些试图解释隐孔层的性能能力的人提供了更深入的了解,并且也可以应用于为这些类型的层创建最佳设计。声功率耗散的方向特性沿硬背变孔层的厚度和横向进行评估。目前的定向量化为那些试图解释隐孔层的性能能力的人提供了更深入的了解,并且也可以应用于为这些类型的层创建最佳设计。声功率耗散的方向特性沿硬背变孔层的厚度和横向进行评估。目前的定向量化为那些试图解释隐孔层的性能能力的人提供了更深入的了解,并且也可以应用于为这些类型的层创建最佳设计。

更新日期:2021-08-03
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